20x times speed up Aws and Azure by using hex

[snuyanzin]

Usage of hex instead of regexify makes about 20x times faster

Benchmark                         Mode  Cnt      Score     Error   Units
DatafakerSimpleMethods.hex       thrpt   10  22772.434 ± 178.039  ops/ms
DatafakerSimpleMethods.regexify  thrpt   10   1034.842 ± 157.265  ops/ms

for tests

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void regexify(Blackhole blackhole) {
        blackhole.consume(DATA_FAKER.regexify("[a-f0-9]{16}"));
    }

    @Benchmark
    @BenchmarkMode(Mode.Throughput)
    public void hex(Blackhole blackhole) {
        blackhole.consume(DATA_FAKER.random().hex(16, false));
    }